165 miles and I got a service 4WD message

[DocHolliday]

So my plot thickens somewhat...the truck reserved for me to replace the one with the issue being bought back - that I was supposed to pick up tomorrow - was "sold out from under" the dealer, or so they say. I am now still in the damn Traverse tin can, with no visibility of when a replacement vehicle will be here. The dealer mentioned potentially ordering one for me which will take 10 weeks. If i order one I think I'll just order the Denali.

I've been patient up till now, but this is really pissing me off.

 

[Reels]

That is just crazy and unimaginable. Feeling sorry for you, but hoping things happen for a reason and it works out in your favor.

 

[humer101]

That is just crazy and unimaginable. Feeling sorry for you, but hoping things happen for a reason and it works out in your favor.

F.. unbelievable here we feel same way.

 

[Last Chance]

So my plot thickens somewhat...the truck reserved for me to replace the one with the issue being bought back - that I was supposed to pick up tomorrow - was "sold out from under" the dealer, or so they say. I am now still in the damn Traverse tin can, with no visibility of when a replacement vehicle will be here. The dealer mentioned potentially ordering one for me which will take 10 weeks. If i order one I think I'll just order the Denali.

I've been patient up till now, but this is really pissing me off.

I'm sorry to hear about your situation. It seems as if you have been very patient throughout this whole process. My Denali has been in service 4 times total and 3 times for the service 4wd and still no fix. I am about to start the lemon law process since GM does not seem to care about us customers buying $70k+ vehicles that they can't fix. Has the GM rep on this board chimed in at all on this issue?

 

[Gassey]

This may out of the date range, but I'm having the same issue. I have a '03 Yukon with 143k miles in it and the "Service 4wd" has come twice. The lights on the bush button 4wd (Auto, 2wd, 4 hi, 4 low) does a bunch of random blinking and has even been in neutral while going down the highway at 70 mph. Any help would be appreciated.

 

[DocHolliday]

I feel like I have some closure and potentially some answers for some others. I was able to order a new LTZ Tahoe today which was fine, I added the retractable running boards, and the upgraded 22'' wheels. I previously had the "standard" 22'' wheels but wanted something a bit different so I'm happy, but have to wait 6-8 weeks for it to get here. I wanted to order the Denali but because this is a transfer of equity with the bank I had to have the same make / model. I'm fine with it really.

The other upside is they are letting me drive my original truck in the meantime. They've said the service 4WD light isn't a safety issue so I thought it good of them to go this route.

The service rep told me it's better to order one as the issue with the transfer case is in a number of unsold trucks and they aren't sure which ones are affected. So, if I were to have taken one off the lot I may have been in the same boat in a few hundred miles. He went on to say the issue is with using the truck in auto as opposed to 2WD. For some reason in auto is causes some transfer cases to heat up and throw the light - but using the same truck in 2WD doesn't cause the problem. Has to do with the clutches being too tight. So...for those that haven't used the auto setting, you might want to for several hundred miles just to see if you got a bad transfer case or not.

 

[humer101]

Just returned from vacation...put 924 miles on the truck, no sign of the dreaded "Service 4WD" message. The truck performed well and ate up miles beautifully, very comfortable on the highway. I ran it in 2WD all the time.

Now that I am home and close to service I will run it in Auto to see if that triggers the issue again. If not, I can only assume that replacement of the transfer case position sensor did the trick.

Side note: The truck was loaded with 6 people, lots of gear, and towing a waverunner - averaged 18.0 mpg for the trip.

Just happens to me today around 3:00 pm on the gas station after that 4wd light come out ,cant even turn.
to the dealer Monday 7:00 am
and i go vacation Thursday.

 

[HAARubicon]

This may out of the date range, but I'm having the same issue. I have a '03 Yukon with 143k miles in it and the "Service 4wd" has come twice. The lights on the bush button 4wd (Auto, 2wd, 4 hi, 4 low) does a bunch of random blinking and has even been in neutral while going down the highway at 70 mph. Any help would be appreciated.

Yours is the Transfer Case Control Module gone bad, not unexpected for your year and mileage. Its a pretty easy fix on yours, but not necessarily cheap.

---------- Post added at 07:47 AM ---------- Previous post was at 07:46 AM ----------

GM really needs to figure this out before it snowballs. Our relearn on the Tcase is still holding.

 

[humer101]

On the dealer now they scanning th truck now we let you guys know the codes.

 

[SVL]

My service tech just called and said that GMC is aware of the problem (duh) and that they are advising dealers to do a re-flash then return the trucks to customers advising them to drive in 2WD only until a solution is available.

Service says that they are starting to see it pop up on Tahoe's as well and more are coming in for this each day. Imagine what will happen when the weather here in Chicago turns (soon) and unsuspecting owners switch into Auto for the first time. This is a big issue with GMC.

So...I am now driving and making payments on a $75,000 truck that I can only use in 2WD with Chicago winter approaching and no fix date provided. It's now a safety issue as well.

Thanks GMC!

 

[OHSIXX]

Hope you guys all get your situations figured out quickly. This thread reinforces my beliefs in never buying the new model when so many changes have been made and not tested(IE from NBS to NNBS and now from NNBS to this unreliable expensive SUV. Best of luck!

 

[humer101]

The guy told me they just update the software for transfer case. we may need a hacker to resolve the problem.

Also he told me if I want to run auto just do because is just keep relearn the system.

 

[hosseface]

How many of you guys with this Service 4X4 problem have had the transfer case relearn/recall done??

Maybe they screwed something up there. I have not had mine done (and will not until it gets older/first scratch/etc) and have had zero problems.

I am currently researching those 2 codes as well.

 

[SVL]

How many of you guys with this Service 4X4 problem have had the transfer case relearn/recall done??

I got the "Service 4WD" message before the relearn was done to my truck. The relearn was the first attempted fix, second was tightening a loose connection, third was replacing the transfer case position sensor, last was "we give up drive it in 2WD".

 

[humer101]

How many of you guys with this Service 4X4 problem have had the transfer case relearn/recall done??

Maybe they screwed something up there. I have not had mine done (and will not until it gets older/first scratch/etc) and have had zero problems.

I am currently researching those 2 codes as well.

Those codes are unknown they don't even know about but service Mechanic told me this is the 4 update so far it may be software programs problems.

---------- Post added at 12:15 PM ---------- Previous post was at 12:14 PM ----------

How many relearn you have already?

---------- Post added at 12:16 PM ---------- Previous post was at 12:15 PM ----------

I got the "Service 4WD" message before the relearn was done to my truck. The relearn was the first attempted fix, second was tightening a loose connection, third was replacing the transfer case position sensor, last was "we give up drive it in 2WD".

How many relearn you have already?
[emoji574]

 

[hosseface]

I just researched both of those codes - absolutely nothing to do with the 4x4.

Both deal with the Adaptive Cruise Control. "Distance Sensing Cruise Control Signal Message Counter Incorrect."

hmmm.... will be surprised if that fixes it but hopefully for you it does.

 

[humer101]

I just researched both of those codes - absolutely nothing to do with the 4x4.

Both deal with the Adaptive Cruise Control. "Distance Sensing Cruise Control Signal Message Counter Incorrect."

hmmm.... will be surprised if that fixes it but hopefully for you it does.

Will let you know later GM ingenie

I just researched both of those codes - absolutely nothing to do with the 4x4.

Both deal with the Adaptive Cruise Control. "Distance Sensing Cruise Control Signal Message Counter Incorrect."

hmmm.... will be surprised if that fixes it but hopefully for you it does.

Will let you know later GM claim going to be open from my side and someone have to answer from ing. Department.
[emoji161]

---------- Post added at 12:44 PM ---------- Previous post was at 12:43 PM ----------

I going vacation Thursday and on my way back which is 280 miles will put back to Auto.
[emoji574]

 

[HAARubicon]

My Service 4wd message came up after the recall work was done. They did the relearn on it and so far so good.

I cycled it again yesterday with no message.

 

[humer101]

My Service 4wd message came up after the recall work was done. They did the relearn on it and so far so good.

I cycled it again yesterday with no message.

I think we face software glitch an they GM are about to figured out.

 

[HAARubicon]

I think we face software glitch an they GM are about to figured out.

I posted this in your other thread:


I have been reading this thread as a supplement to the other thread on this subject. But in this thread some have said that this problem may be user error. This is not the case, it is a computer control error in the system.

Auto 4wd is a system that is designed to sense road conditions and engage if the system decides its necessary. If you are running in auto 4wd on dry pavement, the system is not sensing a need, so basically its a real fancy 2wd setting. My Service light came on after engaging Auto 4wd on a day when I was driving thru down pours and then other areas where the pavement was still dry.

I think the problem here is computer based, there is a problem with the Auto 4wd programing that is causing it to not sense correctly. When our light came on, the truck felt like it was in 4wd when turning, the steering was stiff.

I personally run mine 2wd all the time until conditions call for either Auto or 4 Hi. But there is no problem if a guy wants to run it in auto 4wd all the time, as long as the system is operating properly and sensing road conditions correctly. My gut feeling is that the system may be to sensitive and it is sensing wheel spin while turning. It may actually be a problem with the sensors in the limited slip diff or the anti lock brake sensors or even the traction control sensors.

Either way this is not user error, it is a system based error that GM needs to fix and more than likely will. The model may be new, but these systems are not.

---------- Post added at 09:36 AM ---------- Previous post was at 09:31 AM ----------

I also believe Auto 4wd piggy backs on a number of sensors as mentioned. When you are dealing with as much automation as these things have there is no telling where the real problem may be, and it may be in an area that seems completely illogical, like a brake sensor.